NEET Physics Nuclei Questions Solved

During mean life of a radioactive element, the fraction that disintegrates is 
(a) e            (b)  1e
(c) e-1e     (d) ee-1

(c) By using N=N0e-λt and average life time t=1λ
So N=N0e-λ×1/λ=N0e-1NN0=e-1=1e
Now disintegrated fraction = 1-NN0=1-1e=e-1e

Difficulty Level:

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